Abiotic reduction of trifluralin and pendimethalin by sulfides in black-carbon-amended coastal sediments

Journal of Hazardous Materials
Wenwen GongWei Zhang

Abstract

Dinitroaniline herbicides such as trifluralin and pendimethalin are persistent bioaccumulative toxins to aquatic organisms. Thus, in-situ remediation of contaminated sediments is desired. This study investigated whether black carbons (BCs), including apple wood charcoal (BC1), rice straw biochar (BC2), and activated carbon (BC3), could facilitate abiotic reduction of trifluralin and pendimethalin by sulfides of environmentally-relevant concentrations in anoxic coastal sediments. The reduction rates of trifluralin and pendimethalin increased substantially with increasing BC dosages in the sediments. This enhancing effect was dependent on BC type with the greatest for BC3 followed by BC1 and BC2, which well correlated with their specific surface area. The pseudo-first order reduction rate constants (kobs) for BC3-amended sediment (2%) were 13- and 14 times the rate constants in the BC-free sediment. The reduction rates increased with increasing temperature from 8 to 25°C in the BC-amended sediment, following the Arrhenius relationship. Finally, through molecular modeling by density functional theory and reaction species identification from mass spectra, molecular pathways of trifluralin and pendimethalin reduction were elucidated...Continue Reading

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Citations

Dec 21, 2018·The Science of the Total Environment·Chi WuYongquan Zheng
Jan 25, 2020·Pesticide Biochemistry and Physiology·Bárbara de OliveiraDaniel Junqueira Dorta
Jul 13, 2021·Water Environment Research : a Research Publication of the Water Environment Federation·Hejie QinJunlian Qiao

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